Asymmetric Synthesis of Dihydrofurans via Organocatalytic Domino Michael-Alkylation Reaction
作者:Juhua Feng、Lili Lin、Kunru Yu、Xiaohua Liu、Xiaoming Feng
DOI:10.1002/adsc.201401198
日期:2015.4.13
organocatalyst to catalyze the asymmetric domino Michael–alkylation reaction between cyclohexane‐1,3‐dione derivatives and bromonitrostyrenes. For dimedone, the corresponding bicyclic 2,3‐dihydrofurans with two stereocenters were obtained in up to 99 % yield with 95:5 d.r. and 96 % ee. For prochiral 5‐monosubstituted cyclohexane‐1,3‐diones, the desymmetrization reaction provided the bicyclic 2,3‐dihydrofurans
已开发出手性N,N'-二氧化物C-PrPr 2作为一种有效的有机催化剂,可催化环己烷-1,3-二酮衍生物与溴硝基苯乙烯之间的不对称多米诺骨牌Michael-烷基化反应。对于二甲酮,以95:5 dr和96%ee的产率最高可达99%,获得了具有两个立构中心的相应双环2,3-二氢呋喃。对于前手性5一取代的环己烷-1,3-二酮,去对称化反应提供了具有三个立体中心的双环2,3-二氢呋喃,产率高达90%,dr:82:18,ee高达94%。